Looks like part of a radiator cap?
Disagree. I swear I've seen that thing before, it'll come to me. Maybe something to do with piping, pipe flange something. Pipe support or the like.
Those are generally triangular in shape and have 3 bolt holes and no slots.Exaust manifold to pipe flang clamp is my guess without knowing the size..
Leaveright would be precisely correct..
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